From the cover: "A carefully followed program of filament voltage management can substanitally increase the life expectancy of transmitter power grid tubes. With today's rising operating costs, such a program makes good financial sense."
Extending Transmitter Tube Life - Eimac Application Bulletin No. 18
From the cover: "A carefully followed program of filament voltage management can substanitally increase the life expectancy of transmitter power grid tubes. With today's rising operating costs, such a program makes good financial sense."